Power Mac - G4 DP with mixed PC100 and PC133 SDRAM

Hi
My old G4 DP 450 has 128mb on a PC100 CL2 that came with it and 2 512 PC133 CL3s that were added by CompUSA not long after its purchase several years ago. Didn't realize this til a couple of days ago as I was about to add 2 more 512s. One to replace the 128 and one for the empty slot. My G4's User's Manual specifically says this machine uses PC100s. Can I still just add the 2 512 PC100s or should I chuck all and start from the beginning and put all 512 PC100s in all 4 slots? Should these things even be working together at all?
Thank you